got my malibu back... couple Q's

[360demonRT]

i'll be sure to ask about break in procedures. hate to wipe out a couple hundred bucks worth of cam.... that would suck lol

 

[racecar77]

i'll be sure to ask about break in procedures. hate to wipe out a couple hundred bucks worth of cam.... that would suck lol

It's not just the money for the camshaft.........it's where the metal shavings go when the cam wipes out a lobe.

 

[360demonRT]

yea, the money for the rebuild :-& sure couldnt handle that

 

[cutlass389]

It's not only at break-in but the modern oil chemical additive package has changed across the board. OEMs haven't made a flat tappet for 20 years so they(and the EPA) strong-armed the oil manufacturers to sharply reduce the ZDDP amount because it ashes the catalytic convertors and screws 'em up. That additive is the main defense for the extreme pressures that the nose of the cam lobe experiences in a flat tappet situation. If your block is '85 or newer it's probably roller compatible. Unless you're racing with very high rpms, stock roller lifters work just fine and can be reused unlike flat lifters. Lots of places have stock lifters, dogbones and spiders laying around for cheap and the Hot cam is around $200. Have to watch the distributor gear you are using as the roller cam is harder than a flat cam and needs an equivalent harder gear to survive. A roller cam will always outperform an equal flat cam by virtue of having more aggressive ramps and following the lobe more accurately resulting in more area under the curve(average power).

 

[MalibuMan1979]

It's not only at break-in but the modern oil chemical additive package has changed across the board. OEMs haven't made a flat tappet for 20 years so they(and the EPA) strong-armed the oil manufacturers to sharply reduce the ZDDP amount because it ashes the catalytic convertors and screws 'em up. That additive is the main defense for the extreme pressures that the nose of the cam lobe experiences in a flat tappet situation. If your block is '85 or newer it's probably roller compatible. Unless you're racing with very high rpms, stock roller lifters work just fine and can be reused unlike flat lifters. Lots of places have stock lifters, dogbones and spiders laying around for cheap and the Hot cam is around $200. Have to watch the distributor gear you are using as the roller cam is harder than a flat cam and needs an equivalent harder gear to survive. A roller cam will always outperform an equal flat cam by virtue of having more aggressive ramps and following the lobe more accurately resulting in more area under the curve(average power).

once again i have learned something on this site... it never ceases to amaze me how much i don't know.. i researched what is above and found this to be absolutely TRUE. thanks for the info as i am getting ready for another engine project.

 

[360demonRT]

i'll just have to see what model motor i can get my hands on. if i get a late enough model one i may just save my pennies up. have to wait and see i guess.